<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cart in cartList" :key="cart.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              :checked="cart.isChecked"
              @change="changeCheck(cart)"
            />
          </li>
          <li class="cart-list-con2">
            <img v-lazy="cart.imgUrl" />
            <div class="item-msg">
              {{ cart.skuName }}
            </div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">超短</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a class="mins" @click="count(cart)">-</a>
            <input
              autocomplete="off"
              type="text"
              minnum="1"
              class="itxt"
              v-model="cart.skuNum"
            />
            <a class="plus" @click="add(cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuPrice * cart.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCart(cart.skuId)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="isCheckAll"
          @change="changeCheckAll"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="delSelectedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalChecked }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { reqGetCartList } from "../../api/shopCart";
import { reqUpdateCart } from "../../api/shopCart";
import { reqAddToCart } from "../../api/shopCart";
import { reqDeleteCart } from "../../api/shopCart";

export default {
  name: "ShopCart",
  data() {
    return {
      cartList: [],
      isContinue: true,
    };
  },
  mounted() {
    reqGetCartList()
      .then((response) => {
        this.cartList = response[0].cartInfoList;
      })
      .catch((error) => {
        console.log(error);
      });
  },
  computed: {
    totalChecked() {
      return this.cartList.reduce((pre, item) => {
        if (item.isChecked) {
          return pre + item.skuNum;
        } else {
          return pre + 0;
        }
      }, 0);
    },
    totalPrice() {
      return this.cartList.reduce((pre, item) => {
        if (item.isChecked) {
          return pre + item.skuNum * item.skuPrice;
        } else {
          return pre + 0;
        }
      }, 0);
    },
    isCheckAll() {
      if (!this.cartList.length) {
        return false;
      }
      return (
        this.cartList.reduce((pre, item) => {
          return pre + item.isChecked;
        }, 0) === this.cartList.length
      );
    },
  },
  methods: {
    async changeCheck(cart) {
      const checked = 1 - cart.isChecked;
      await reqUpdateCart(cart.skuId, checked);
      //并且要修改状态中的值，否则只有服务端修改了，客户端的数据还没有修改，如果重新发一次请求是会刷新数据的，但是要减少发请求的次数
      cart.isChecked = checked;
    },
    changeCheckAll(e) {
      this.cartList.forEach(async (item) => {
        //不一样的才发请求
        if (item.isChecked !== +e.target.checked) {
          await reqUpdateCart(item.skuId, +e.target.checked);
          item.isChecked = +e.target.checked;
        }
      });
    },
    async count(cart) {
      /* 做一个判断，防止连续点击出现意想不到的结果 */
      if (this.isContinue) {
        if (cart.skuNum <= 1) {
          cart.skuNum = 1;
          return;
        }
        this.isContinue = false;
        await reqAddToCart(cart.skuId, -1);
        cart.skuNum--;
        this.isContinue = true;
      }
    },
    async add(cart) {
      /* 做一个判断，防止连续点击出现意想不到的结果 */
      if (this.isContinue) {
        this.isContinue = false;
        await reqAddToCart(cart.skuId, 1);
        cart.skuNum++;
        this.isContinue = true;
      }
    },
    async deleteCart(skuId) {
      await reqDeleteCart(skuId);
      this.cartList = this.cartList.filter((item) => item.skuId !== skuId);
    },
    delSelectedCart() {
      this.cartList = this.cartList.filter((item) => {
        if (item.isChecked) {
          this.deleteCart(item.skuId);
        }
        return item.isChecked === 0;
      });
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;
        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>